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Finding the Fourth Proportional to 128,975.63, 177,986.36 and 72,387

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Solution

The fourth proportional to 128,975.63, 177,986.36 and 72,387 is: 99,894.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,975.63 : 177,986.36 = 72,387 : x
  2. Step 2: Convert to fraction form
    128,975.63/177,986.36 = 72,387/x
  3. Step 3: Cross multiply
    128,975.63x = 177,986.36 × 72,387
  4. Step 4: Simplify right side
    128,975.63x = 12,883,898,822.29
  5. Step 5: Solve for x
    x = 12,883,898,822.29/128,975.63
  6. Step 6: Final answer
    x = 99,894.06

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.